Eltrid-pressuroe phmp



H. W. TRUSCOTT.

FLUID PRESSURE PUMP.

APPLICATION FILED APII.8. I9I8,

1 ,3 1 6,468. Patented Sept. 16, 1919.

5 SHEETS-SHEET l.

1 e. M Een* Vw Gum/nuja H. W.'TRUSCOTT.

FLUID PRESSURE PUMP.

APPLICATION. FILED APH. 8. I9Is.

Patented Sept. 16, 1919.

5 SHEETSSHEET 2.

@mi/'M4000 THF. rmunlm PLANouRAPII cm, IsHINnToN, n, c.

H. W. TRUSCOTT.

FLUID PRESSURE PUMP.

APPLICATION FILED APII. 8. 1918.

1,816,468. Patented sept. 16, 1919.

I 5 SHEETS-SHEET 3. ELE- E 7 nvemtoz .ummm II Mmmm un., WASHING-ron. Ix c.

H. W. TRUSCOTT.

FLUID PRESSURE PUMP.

APPLICATION man Ams. 191s.

Patented Sept. 16, 1919.

5 SHEETSv-SHEET 4.

r mm WW :PIE- ll @14mm/4301 Hjfascoff H. w. TRUSCOTT.v

FLUID PRESSURE PUMP.

APPLI'CATION FILED APR.8. 15H8. 1,316,468, PatentedSept. 16,1919.

5 SHEETS-SHEET 5.

@minuto/L mmm 2) a Q im 0 flaw- 13 UNITED STATES PATENT OEEroE.

HOWARD W. TRUsoOTT, OE JENNINGS LODGE, OREGON.

ELUIDREssU'RE PMP.

enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in that class of pumps usedin water supply syst-ems for dwellings and other buildings and employing fluid under pressure to force the water from a well, such pressure being automatically applied to Operate the pump when any spigot of the system is opened.

The principal Object of the invention is to simplify the construction of pumps of this class without in any manner impairing their efiiciency and in fact rendering them more efficient and less apt to require as much attention.

lVith this general object in view, the invention resides in the novel features of construction and unique combinations of parts to be hereinafter fully described, and claimed, the descriptive matter being supplemented by the accompanying drawings which form a part of this specification and in which: i

Figure 1 is a vertical sectional view partly in elevation showing the upper chamber in the act of filling and the lower chamber in the act of discharging;

Fig. 2 is a second vertical section on the plane of line 2--2 of Fig. 1;

Fig. 3 is an enlarged vertical section of the head casting and the valve mechanism thereof;

Fig. t is a top plan view of said head casting;

Fig. 5 is a side elevation thereof;

Fig. 6 is an end elevation of the head Casting;

Fig. 7 is a vertical section on the plane of line 7 7 of Fig. 6;

Fig. 8 is a vertical transverse section on the plane of line 8-8 of Fig. 7

, Fig. 9 is a horizontal section on the plane of line 9 9 of Fig. 7; and v v Fig. 10 is a bottom plan view of the head casting. I

Fig. 11 is an edge view of the 'center cast-7 ine;

Specification of Letters Patent. Patented Sept 16, 1919. Application filed Aprn s, 191s. i

Serial No. 227,299.

Figs. 12 and 13 are respectively top and bottom views of this casting;

Fig. 14v is a vertical section as indicated by line 144111 of Fig. 12;

F ig. 15 is a vertical section on the lin 15s-15 of Fig. 12;

Fig. 16 .is a horizontal section on the plane i of line 16-16 of Fig. 11;

Fig. 17 is a horizontal section of the foot casting on the plane designated by line 17-17 of Fig. 2; and

Fig. 18 is a vertical section of the foot casting as indicated by lines 18-18 of Fig. 17.

Fig. 19 is a horizontal section on line isi-ietf Eig. 1;

Fig. 20 is a detail vertical section on line Fig. 21 'is a bottom plan view of one-of the trip valve bodies; and

'Fig'. 422 is a top plan view of one of the trip valve levers.

To specifically describe the pump shown i in the drawings above briefly described, like reference characters have been placed on the same parts throughout the several views and reference will be herein made to these parts Closing the Vupper end of the The Y lower all of these parts, VJthat is the cylinders and the castings being tied together by longitudinal tie rod R, four of which are preferably used.

The water inlets of the cylinders U and L are located respectively in the castings C and F and a better understanding can be had by first describing these parts, reference being made more particularly to Figs. 1,1 to 18 but also to the assembled views, Figs. 1 and A2 for instance. yEach VCasting C F includes an upper end plate land a lower end plate 2 connected near their edges by a vertical water outlet 3, `by a vertical check valve chamber 4, by a water outlet passage 5, and a pair of divergent partitions 6 andf7;

The parts 3, 4 and 5 are all closely related and integrally joined while the partitions 6 and 7 extend in substantially opposite directions from them to the edges of the plates 1 and 2, these parts forming with a screen 8 a water inlet chamber, but in some cases the screen may well be omitted.

The upper end plate 1 is provided with a water inlet 9 having on .its upper side a valve seat 10 upon which a suitable inlet check valve 11 rests, said valve having a depending stem 12 slidable in a guide 13, this guide being carried by arms 14 which extend respectively to the water outlet passage 5 and to a vertical web 15 between the edges of the plates 1 and 2. Stem 12 is provided with a stop 16 to prevent withdrawal from the guide.

Referring more specifically to certain parts above mentioned, it may be said that the water outlet passage 3 of the central casting C is open at both ends while a plug 17 closes the lower end of the corresponding passage of casting F. This passage in both castings communicates with the check valve chamber 4 by way of a port 18 above the seat 19 of said chamber, and the lower end of the water outlet passage 5 of each of said castings turns outwardly at 20 and discharges into said chamber 4 below its seat. A ball valve 21 rests on this seat and is trapped in the chamber 4 by a plug 22 closinfr the upper end thereof.

l ach cylinder fills through its inlet valve 11 and when fluid pressure is admitted, the water is driven down the outlet 5, through the chamber 4, and out port 18 to the outlet 3, the check valve 21 being raised from its seat to permit this travel of the water. From the passage 3 of the foot casting F, the water rises through a water outlet pipe 2,3 (Fig. 2) to the passage 3 of casting C and from this passage, another water outlet pipe 24 rises to the head casting H for communication with the distributing main not shown. The upper end of each pipe 23-24 is threaded into the adjacent casting, while a slip connection is employed at the other end for ease in assembly and disassembling.

A feature of dilference between the two castings C and F is that whereas the partition 7 of casting F is uninterrupted, the corresponding partition of casting C includes an air supply passage 25 for the lower cylinder L, and a second water passage 26 through which the initial escape of water from said lower cylinder takes place to trip or reverse the air valve V yet to be described (see Figs. 12, 15, 16 and 17).

From the foregoing, the structure of the castings C and F will be understood, but it may be well to add that these castings are provided with annular ianges 27 for engagement of the cylinders U and L and are also equipped with openings 28 for the tie rods R.

For supplyinoV fluid pressure to the upper cylinder U, a port 29 is formed through the bottom of the head casting H and from a similar port 29 in said casting, a pipe 30 (Figs. 1, 3 and 15) leads to the passage 25 of casting C for supplying fluid pressure to the lower cylinder L. rlhe upper end of pipe 30 is threaded in casting H but at 31 (Fig. 15) its lower end has a packed slip joint connection with casting C. The passage of Huid pressure into the two cylinders U-L is controlled by the valve V and for shifting this valve so as to supply the pressure first to one cylinder and then t0 the other, the arrangement described below is employed.

A tube 32 depends from casting H and is preferably threaded therein, the lower end of said tube having a packed slip joint connection at with passage 26 of casting C. A second tube 34 is threaded in and depends from passage 26 into cylinder L, and a' third tube 34 is threaded into casting H and depends into cylinder U. The lower ends of the two tubes 3%34 are threaded in sock ets 35 formed on the upper sides of a pair of trip valve bodies .36 as seen rather clearly in Fig. 1, but detailed in Figs. 19, 20, and 21. These bodies are each in the form of a' horizontal bar preferably curved to conform to the wall of the cylinders and having its ends formed with openings 37 through which the tie rods R pass. rIhe lower ends of the tubes 34-34 communicate with ports 38 which open through valve seats or nipples 39 formed on the lower sides of the bodies 36; and trip valves 40 of rubber or the like coact with said seats and are inset in valve levers 41 which at 42 are fulcrumed between ears 43 depending from the bodies 36, said bodies having stops 44 to limit the downward movement of the levers.

A float 45 is located in each cylinder U-L, the lower end of each fioat having a depending stein 46 pivotally connected at 47to the free end of the adjacent lever 41 as seen in Figs. 1 and 20. The upper end of each float 45 is provided with a stem 48 sliding through a guide arm 49 suitably secured to tube 34-34.

When either cylinder (U for instance) is sufficiently filled with water to sustain the float, the latter closes the valve 40 with which it is connected and holds it in closed position as long as the float remains raised. However, while this cylinder is filling the other (L) is discharging and the moment the float of the latter lowers sufficiently, the valve 40 of this cylinder is auton'iatically opened. rlhe result is that water pressure is released from cylinder L and rushes through tube 34, passage 26 and tube 32 to trip or reverse the valve V. The fluid pressure is now supplied to cylinder U through port 29 and drives the water from this cylinder out through its passages 5,1 4 and 3 into the out-y let pipe 24. When the water level lowers sulliciently, the float opensthe trip valve 4() of the upper cylinder U and thus the valve V is again tripped to continue its proper operation. After initial vescape of pressure upon opening the trip valve, the lower cylinder L exhausts through passage 25 and pipe 30 to port 29 'while cylinder U exhausts through port 29.v Fromthese ports the exhaust is handled by the valve V as will appear after the following specifi@ description of this valve and the head casting H.

The casting in question includes a circular base 50 flanged at 51 for engagement with the upper cylinderU and having sockets 52 for the tie rods R; and formed integrally with the upper1 side of said base is a horizontal valve cylinder 53, the joined portions of said cylinder and base being recessed to form an exhaust manifold 54 shown'most clearly in Figs. 3, 7, S and 9. A pair of exhaust ports 55 lead intov the manifold 54 from the ends of the cylinder 53 and serve to conduct the exhaust pressure thereto which ig discharged into said cylinder by way of the ports 29-29, the communication between these ports 29-29 and the ports 55 being controlled by the valve V. A main exhaust 56 leads from the manifold 54 and is connected with an exhaust pipe not shown.

A central transverse partition 57 is formed across the cylinder 53 and the ports 29-29 enter said cylinder at oppositesides of said partition. A fluid pressure supply port 58 is formed in the partition 57 and discharges into a port 59 formed through the center of said partition, and the passage of fluid pressure from these ports through ports 29-29 to expel the water from lthe cylinders U-L, is controlled by the aforesaid valve V. The initial exhaust for tripping the valve is supplied from the tubes 32 and 34 to the ends of the Acylinders by'way'of ports 60 formed in the base ofthe casting H, said ports deliveringV into internal grooves 61 with 4which the end closures 62 of the cylinder 53 are provided. A pair of bleed ports 63 lead from the ports 60 into the exhaust manifold 54 and serve to permit the escape of water left in the cylinder 53 after tripping the valve V. This water is blown out with the exhaust air from the manifold.

The valve V includes a stem 64 passing through the center of the port 59 and having its ends extending into the cylinder 53 on opposite sides of the partition 57 each half of said stem having a hub 65 loosely slidable thereon, the inner end of each hub 65 being provided avith an integral head 66 having an intake valve gasket 67 fo-r closing theyadjacent end of port 59. Threaded around each head 66 is a valve ring 68 having anexhaust valve gasket 69, the two gaskets 69 co'acting with fixed seat rings 70 in the cylinder 53. The outer end of each hub 65 has formed thereon a trip piston 71 having a concave outer side. By suitable means 72, a pair `of diaphragms 73 are clamped at their edges against the outer sides of the pistons, the centers of said diaphragins being secured at 74 to the ends of the -rod or stem 64. The two hubs are held in spaced relation by a sleeve 75 on the stem V64, but the only connections which these hubs have with said stem are through the diaphragms 73. By this means, the two hubs are not held in truly fixed relation and thus the several valve gaskets 67 and 69 may more accurately engage their seats. For instance, wear of the gaskets carried by lone hub will in no manner affect proper seating of the other gaskets.

Completing the construction of the valve V,-isa pair 'of sleeves 76 extending slidably through the central openings lof the rings 70 and oined at their ends to the heads 66 and pistons 71, said sleeves properly centering said heads to insure accurate contact of their valve gaskets 67 and 69 with they respective seats thereof. As it is necessary that the eX- haust pressure from the cylinders U L must pas's by the rings 70, the sleeves 76 are formed with ports 77 and 78 at their ends'7 whereby the exhaust pressure passes into the sleeve through the ports 78 and leaves them through the po-rts 77. From these ports, the exhaust enters the manifold 54 through the ports 55 and escapes at 56.

The general operation of the pump follows: When the parts stand as seen in Figs. 1 and 3, the fluid pressure from ports 58 and 59 is discharged into the left hand end of cylinder .53 and passes from here through port 29', pipe 30, and passage 25 into the lower cylinder L to discharge the water from the latter. The pressure also passes through the left hand hub 65 and thrusts outwardly upon the adjacent diaphragm 73, thus, together with the pressure in the right hand end o-f the cylinder 53 which has previously shifted or tripped the valve, moving the stem 64 to the left so that the right hand connection 74 forces the adjacent hub 65 to the left, thereby strongly seating the valve gasket 67 of this hub o-ver the port 59. At

the same time the pressure is closely sea-ting the left hand gasket 69, while the other two gaskets are free of their seats.

The fluid pressure supplied to the lowe cylinder L drives thel water from the latter through the passages 5, 4, 18 and 3 of the foot casting and vthis water is expelled through the pipes 23 and 24. As the water levelV in cylinder L thus lowers, its float 45 drops until it opens its respective trip valve 40. Upon this operation, water pressure escapes through tube 34, passage 26, tube 32 and the communicating port 60, into the left hand end of cylinder 53. This shifts the valve V to the right and it thus follows that fluid pressure is admitted to the upper cylinder and the lower cylinder permitted to exhaust its pressure and take in water through its inlet valve 11.

Vhile the lower cylinder is discharging, the upper cylinder is filling with water and the fluid pressure is escaping from this cylinder through the port 29 and the ports of the right hand sleeve 76, into the cylinder' 53; and from this cylinder it enters manifold 54 through right hand port 55, leaving said manifold at 56.

While cylinder L is filling, the fluid pressure escapes through passage 25 and pipe 30 to port 29 and from the latter itscourse is identical with that above described, but in the left hand end of the cylinder 53.

The operation of both cylinders U-L is the same and further description will not therefore be given but it may be further stated that the operation of the two cylinders is opposed, one always filling while the other is discharging, whereby the operation of the pump is continuous. It may also be well to add a further explanation of the valve V. When the pump is in operation and standing as shown in Figs. 1 and 3, upon opening of valve 10 in lower cylinder L, water pressure rushes upwardly through pipe 34, passage 26, pipe 32 and passage 60 ehind the trip piston 71. As the area of this piston 71 is greater than that of the diaphragm 73 or the opening in the ring 70, the valve V is shifted. This movement is almost instantaneous and opens and closes the valve seats 67 and 69 in this manner. The valve V in moving, rst opensthe right hand inlet port 59 and second, closes the right hand exhaust port 7 8 and as the left hand exhaust port 7 8 has not yet opened, the two halves of the valve V are the same as pistons since the two exhaust ports 78 are closed by the sleeve 76. Also they are in balance as one is opposed to the other. This movement has left uncovered the two ends of the port 59 allowing air to flow into the upper cylinder U and the lower cylinder L through their respective ports. In this manner no pulsing is shown in the flow of p water from the pump as the air pressure is evo always applied to the filled cylinder before being exhausted from the empty cylinder. As the pressure has not been reduced in the lower cylinder L, it will continue to exert a force on the left hand trip piston 71 to complete the stroke of the valve V and as it does so the port 78 in the left hand sleeve is opened allowing the air to escape from the lower cylinder L so that said cylinder will again fill through its inlet valve 11. The opening of the left hand port 78, allowing air to escape from the lower cylinder L, unbalances the valve V. Also the pressure on the left hand trip piston 71 starts dropping to zero. Although the valve seat 69 in the right hand side has not yet seated, the sleeve 76 is closing port 78 and forming a piston, the air from port 5a then acting on the right hand diaphragm 73 and the gradually dropping pressure in the right hand end of the cylinder, acting on the other diaphragm, to force and hold the left hand valve seat 67 and right hand valve seat 69 to their respective seats.

From the foregoing, taxen in connection with the accompanying drawings, it will be seen that the invention is comparatively simple and compact, yet highly efficient and durable. Whenever repairs are necessary, the pump may be easily disassembled and all parts are then readily accessible.

Particular emphasis is laid upon the sectional construction, that is the cylinders U-L, the castings H, C and -F and the tie rods R, upon the construction and mounting of the trip valves, upon the novel features of the valve V, upon the construction of the three castings above referred to, and in fact upon the general Vconstruction and arrangement of parts. Excellent results are obtained from the construction shown and the latter is therefore preferable, but within the scope of the invention as claimed, numerous minor changes may well be made.

I claim:

1. In a fluid pressure pump, the combination of upper and lower alined cylinders, a center casting between and closing the adjacent ends of said cylinders, a valve cylinder having a hollow base forming an exhaust manifold, said base closing the upper end of the upper cylinder, a foot casting closing the lower end of the lower cylinder, a main water outlet passage, water inlet valves in said foot and center castings, valved water outlet passages in these cast ings discharging into said water outlet passage, a fluid pressure supply for said valve cylinder, and means including an automatic pneumatic valve in said valve cylinder for controlling the supply of fluid pressure to said cylinders and the exhaust of such fluid pressure therefrom into said manifold.

2. In a fluid pressure pump, the combination of upper and lower alined cylinders, a center casting between and closing the adjacent ends of said cylinders, a head casting closing the upper end of the upper cylinder, a foot casting closing the lower end of the lower cylinder, a main water outlet passage, water inlet valves in said foot and center castings, valved water outlet passages in these castings discharging into said water outlet passage, a fluid pressure supply for said head casting, and means including an automatic valve in said head casting for controlling the supply of fluid pressure to said cylinders, and the exhaust of said fluid pressure therefrom; said center casting including upper and lower end plates, said valved water outlet passage of this casting and a portion of said main water outlet being normally joined to each other and interposed between and joined to said end plates, said water inlet valve of the center casting being located in said upper end plate, and a pair of partitions on opposite sides of said inlet valve extending from said integrally joined parts to the edges of the castingk to form a water inlet chamber.

3. In a fluid pressure pump, the combination of upper and lower alined cylinders, a center casting between and closing the adjacent ends of said cylinders, a head casting closing the upper end of the upper cylinder, a foot casting closing the lower end of the lower cylinder, a main water outlet passage, water inlet -valves in said foot and center castings, valved water outlet passages in these castings discharging into said water outlet passage, a fluid pressure supply for said head casting, and means including an automatic valve in said head casting for controlling the supply of fluid pressure to said cylinders, and the exhaust of such fluid pressure therefrom, said foot casting including upper and lower end plates, said valved water outlet passage of this casting and a portion of said main water outlet being integrally joined to each other and interposed between and joined to said end plates, said water inlet valve of the foot casting being located in said upper end plate, and a pair of partitions on opposite sides of said inlet valve extending from said integrally joined parts to the edges of the casting to form a water inlet chamber.

l. In a fluid pressure pump, the combination of upper and lower alined cylinders, a center casting between and closing the adjacent ends of said cylinders, a head casting closing the upper end of the upper cylinder, a foot casting closing the lower end of the lower cylinder, a. main water outlet passage, water inlet valves in said foot and center castings, valved water outlet passages in these castings discharging into said water outlet passage, a fluid pressure supply for said head casting, and means including an automatic valve in said head casting for controlling the supply of fluid pressure to said cylinders, and the exhaust of said fluid pressure therefrom; said center casting including `upper and lower end plates, said valved water outlet passage of this castingv and a portion of said main water outlet being normally joined to each other and interposed between and joined to said end plates, said water inlet valve of the center casting being located in said upper end plate, and a pair of partitions on opposite sides of said inlet valve extending from said integrally Joined parts to the edges. of the casting to form a water inlet chamber; said foot casting including upper and lower end plates, said valved water .outlet passage ,of this castbeing integrally joined to each other and interposed between and joined to said end plates, said water inlet valve ofthe foot casting beingV located in said upper end plate, and a pair of partitions on opposite sides of said inlet valve extending from S3-'ld integrally joined parts to the edges of the casting to form a water inlet chamber.

5. In a fluid pressure pump, the combination of upper and lower alined cylinders, a center casting between and closing the adjacent ends of said cylinders, a head casting closing the upper end of the upper cylinder, a foot casting closing the lower end of the lower cylinder, a main water outlet passage, water inlet .valves in said foot and center castings, valved water outlet passages in these castings discharging into said water outlet passage, a fluid pressure supply for said head casting, and means including an automatic valve in said head casting for controlling the supply of yfluid pressure to said cylinders, and the exhaust of said fluid pressure therefrom; said head casting comprising a base and a horizontal valve cylinder joined lintegrally to the upper side thereof, the joined portions of said base and cylinder beingy recessed to form an exhaust manifold, a central transverse partition in said cylinder, having a bore at its center, said fluid pressure supply discharging into said borepressur e outlets from saidv valve cylinder adjacent opposite sides of said partition, .and exhaust ports from said valve cylinder finto said exhaust manifold, said automatic valve operating in said valve cylinder and controlling said fluid pressure outlets and said exhaust ports.

' 6. A structure as specified in claim 5, to-

gether with Vinitial fluid pressure exhaust passages from said upper and lower cylinders terminating in ports discharging into the ends of said valve cylinder for tripping said automatic valve, bleed ports from said last named ports into said exhaust manifold, and fluid controlled valves controlling said initial exhaust passages.V

7 In a fluid pressure pump the combination of a cylinder having a valved water inlet and a valved water outlet, tie rods in said cylinder connecting the ends. thereof, a fluid `pressure inlet into said cylinder, an auto- Vmatic valve for controlling said fluid pressure inlet, and an exhaust pipe depending into said cylinder for conveyin the in1t1al exhaust pressure therefrom to trip said automatic valve; together with a trip valve body at the lower end of said exhaust pipe and having connection with said tie rods, a trip 'valve mounted on said body for controlling .the V@haast @f .fluid presser@ therethrough,

ing and a portion of said main water outlet and a float in said cylinder for controlling said trip valve.

8. A structure as specified in claim 7, said trip valve body being secured to said exhaust pipe, and said connection with said tie rods comprising openings in said body through which said rods pass.

9. A structure as specified in claim 7 said trip valve body having a valve seat on its lower side and a lug adjacent said seat, and said trip valve comprising a lever fulcrurned to said lug and having a plug coacting with said seat.

10. In a fluid pressure pump, the combination of a pair of water cylinders having valved inlets and outlets, a valve cylinder, a uid pressure supply into said valve cylinder, and means including an automatic valve in said valve cylinder for controlling the supply and exhaust of fluid pressure to and from'said water cylinders, said valve com-` prising a stem, valve members slidable on the two halves of said stem, pistons joined to said valve members, diaphragms secured at their edges to the outer sides of said pistons and means securing the centers of said diaphragms to the ends of said stem.

11. In a fluid pressure pump, the combination of a pair of water cylinders having valved inlets and outlets, al valve cylinder having a central transverse partition and closed ends, said partition having a central bore and a fluid pressure supply port discharging into the same, fluid pressure supply passages from opposite sides of said partition into said water cylinders, exhaust ports fromy said valve cylinder, seat rings in said valve cylinder between said pressure supply passages and said exhaust ports, initial exhaust passages into the ends of said valve cylinder and oat controlled valves for said initial exhaust passages; together with a valve stem passing loosely through the central bore of said partition, longitudinally ported hubs loosely slidable on the two halves of said stein, heads on the inner ends of said hubs having valve means for closing the ends of said central partition bore and for coaction with said seat rings, pistons carried by the outer ends of said hubs and slidable in the ends of said valve cylinder, diaphragme secured at their edges to the outer sides of said pistons, and means connecting the centers of said diaphragms to the ends of said stem.

12. A structure as specified in claim 11, together with sleeves spaced around said hubs and joined to said heads and pistons, said sleeves sliding through the central openings of said seat rings and having exhaust ports at their ends.

13. A casting for the herein described fluid pressure pump comprising upper and lower end plates, a main water outlet pasl sage, a second water outlet passage discharging into said main water outlet passage and having a valve seat, the two passages being joined integrally and extending from one end plate to the other, a water inlet in the upper end plate, and a pair of partitions between said end plates on opposite sides of said inlet and extending from said joined passages to the edge of the casting to form a water inlet chamber whose open side may be screened.

14. Ahead casting for the herein described fluid pressure pump comprising a base, a valve cylinder joined to the upper side of said base and having a central transverse partition formed with a central bore into which a fluid pressure supply discharges, fluid pressure supply ports from said cylinder on opposite'sides of said partition, the joined portions of said cylinder and base being recessed to form an exhaust manifold, exhaust ports from said cylinder into said manifold, and trip piston ports into the ends of said cylinder.

15. A structure as specified in claim 14, together with bleed ports from said trip piston ports into said exhaust manifold.

16. A trip valve body for the herein described fluid pressure pump comprising a bar having a port opening through its upper and lower sides, said bar having a valve seat at the lower end of said port and a pivot lug adjacent said seat, the ends of said bar having vertical openings.

17. A control valve for the herein described fluid pressure pump comprising a stem, valve members slidable on the two halves of said stem and having pistons on their outer ends, diaphragme secured at their edges to the outer sides of said pistons, and means securing the centers of said diaphragme to the ends of said stem.

18. A control valve for the herein described fluid pressure pump comprising a stem, a pair of longitudinally ported hubs slidable freely on the two halves of said stem, valve heads on the inner ends of said hubs, pistons on the outer ends thereof, diaphragms secured at their centers to the ends of said stem and secured at their edges to the outer sides of said pistons, and sleeves spaced around said hubs and joined to said heads and pistons, the ends of said sleeves having ports.

19. A valve part for the herein described fluid pressure pump comprising a hub having a valve head on one end and a piston on its other end, together with asleeve spaced around said hub and joined to said head and piston, the ends of said sleeve having ports.

20. In a Huid pressure pump, the combina tion of a water cylinder having a water inlet and a water outlet, a valve cylinder having a hollow base closing one end of said water cylinder and forming an exhaust manifold, fluid pressure supply means leading to said Valve cylinder, and means including an automatic pneumatic valve operating in said valve cylinder for eecting pneumatic discharge of Water from said Water cylinder and for placing said Water cylinder in communication With said exhaust manifold at the completion of such discharge.

21. A head casting for the herein described iuid pressure pump, comprising a valve cylinder having a hollow base forming an exhaust manifold and adapted to close one end of a Water cylinder, said base and cylinder being equipped for the handling of the Huid pressure used to operate the pump.

In testimony whereof I have hereunto set 15 my hand in the presence of tWo subscribing Witnesses.

HOVARD W. TRUSCOTT.

Witnesses:

WV. S. UREN, MARY B. UREN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

